The GetBits command extracts the specified bits from a number. The locns argument can be a sequence of bit locations or bit location ranges, including negative ranges and negative offsets. Note that all bit locations are given with 0 as the location of the least significant bit. For example, -1..0 can be used to extract the bits in a number in reverse order.

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The optional arguments for GetBits are as follows:

output=form: where form can be sequence (the default), or number. When form is specified as sequence, the output will be in the form of a sequence of 0's and 1's corresponding to the specified bit locations. When form is specified as number, the bit sequence will be used to construct a number, where the first bit in locns will be the least significant bit in the output number.

bits=count: specifies the number of bits in the input number. Any bit references that exceed this value will have a value of zero. Any negative bit references that go past the least significant bit will return an error. The default bits value can be set via Settings.